Tooth Error Correction (TEC) Service Bay Guidelines

Deceleration Fuel Cut-Off
This procedure is very convenient because it can be done in the service bay.

CAUTION: Appropriate safety measures should be taken to assure the safest conditions possible for all those people in the nearby vicinity of where the tooth error learn procedure is being performed.

Vehicle Preparation Requirements and Safety Issues
The vehicle needs sufficient engine oil, automatic transmission fluid, manual transmission gear box oil, power steering fluid, coolant, and brake fluid. Engine noise and exhaust should be considered by each assembly plant when deciding the location to perform the tooth error learn. Proper safety precautions should be taken. Anticipate unusual events such as a manual transmission accidentally being bumped into gear or a foot slipping off a clutch at high engine speed. The vehicle may cause other vehicles to be hit. If the transmission is in Park during the high engine speeds, the transmission Park Ratchet experiences excessive vibration and may momentarily slip. The vehicle is typically then in a Neutral type state and may roll, especially if the vehicle is on an incline. Under this condition the transmission should not slip into gear.

The following summarizes the engine preparation requirements for a tooth error learn.

Requirements:
1. At least 4 minutes of engine run time is required to have occurred at lest once during the life of the vehicle to insure that all of the oil passages are flushed of debris from machining, casting, and assembly.
2. At least 5 seconds of engine run time is required during the same key cycle as the tooth error learn to fill the oil passages and provide proper lubrication. 10 seconds is the preferred guideline.
3. At least 65 degrees Celsius Coolant temperature. Engine oil temperature of 38 degrees Celsius is required for lubrication, which correlates (in most engines) to 65 degrees Celsius Coolant temperature.
This is a recommendation to insure a sufficiently lubricated engine 65 degrees Celsius Coolant temperature correlates to an engine oil temperature of 38 degrees Celsius.

4. Vehicle must be in Park or Neutral. For a manual transmission vehicle, the
clutch does not need to be depressed. The tooth error learn may be performed with either:
1. Gear box in Neutral, it does not matter if the clutch is depressed or not.
2. Gear Box in a gear and clutch depressed.

NOTE: The first option is the recommended option due to safety concerns. The second option has the risk of the operators foot slipping off of the clutch with the vehicle being revved up and in gear.

5. A/C should always be turned OFF before performing the TEC learn procedure.
6. A Class II command from the Scan Tool is required to invoke the TEC learn procedure.
7. No Camshaft and/or Crankshaft Sensor DTC Codes present.

Considerations For Locating The Tooth Error Learning Procedure
The area that the tooth error learn is done should be well ventilated or have vehicle exhaust elimination system which attaches to the tail pipe and draws the vehicle exhaust out of the building.

CAUTION: Appropriate safety measures should be taken to assure the safest conditions possible for all those people in the nearby vicinity of where the tooth error learn procedure is being performed. If possible, anchored or secured safety barriers should be in place in at least the front of the vehicle and in the back of the vehicle it possible to reduce the possibility of accidents. The figure below shows the proper placement of a frontal safety barrier.

The area that the tooth error learn is done should be well ventilated or have vehicle exhaust elimination system which attaches to the tail pipe and draws the vehicle exhaust out of the building.